28 Questions
What is the expression for work done by a force?
F × d
What is the direction of the displacement of the body in Fig 21?
The direction of the force
How is the component of force in the direction of displacement found?
By finding the cosine of the angle between the force and the direction of displacement
What is the angle between the force and the direction of displacement in Fig 22?
9°
What is the purpose of finding the work done by a force?
To find the energy transferred to the body
What is the condition for the work done by a force to be zero?
When there is no displacement or when the displacement is normal to the direction of force.
What happens to the kinetic energy and speed of a body moving in a circular path?
The kinetic energy and speed of the body do not change.
What is the direction of the force acting on a body moving in a horizontal plane?
The force acting on the body is directed towards the center.
What is the work done when the displacement is in a direction opposite to the force?
The work done is negative.
How is the work done determined when the force acting on the body varies during displacement?
By plotting force-displacement graphs.
What is the relationship between the centripetal force and the displacement in a circular path?
The centripetal force is directed towards the center, and the displacement is tangent to the circle.
What is the direction of the force of gravity on a body?
Downwards
What is the formula for the work done by the force of gravity on a body?
W = mgh
Is the work done by the force of gravity dependent on the path taken by the body?
No
What is the unit of work in the CGS system?
Erg
What is the formula for power?
P = W/T
When a body goes up a vertical height, what kind of work is done?
Work against the force of gravity
What is the definition of energy?
The capacity of a body to do work.
What is the difference between energy and work?
Energy is the capacity to do work, while work is the actual act of doing it.
What is the unit of power?
Watt (W)
What is the condition for no transfer of energy?
When a force is normal to the direction of a body's displacement.
What is the relationship between power and energy?
Power is the rate of doing work, or the rate of transfer of energy.
What is the scalar quantity that is related to power and work?
Energy
What is the force required to lift a car of mass 500 kg to a vertical height of 4 m?
4900 N
What is the work done by the crane in raising the car to a vertical height of 4 m?
19600 J
What is the relation between work and energy?
Work done is equal to energy transferred
What is the unit of energy commonly used in food labeling?
Calories
What percentage of lions' energy is obtained from feeding on 1 kg of meat?
10%
This quiz assesses your understanding of work and displacement in physics. It covers topics such as force, direction, and distance. Test your knowledge of the fundamental principles of physics.
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